It occurs to me that we're all being hyped up to assume David 8 is going to be a villain who orchestrates everything, but what if that's all a big red herring? We can see him observing a hatching egg, but what if he has a sort of 'greater good' mentality or, for some reason, doesn't think it would be wise to intervene? What if we're being set up for something less predictable?
What if, say, Shaw is responsible because she's now got some kind of nihilistic mentality (possibly by linking into Engineer technology and allowing it to influence her, 'Mass Effect' Reaper-style) and David 8's experimentation has actually just been one big effort to try and stop her? Or what if Shaw's actually reprogrammed David 8 and he's doing everything because she's controlling him?
Would you want David 8 to fill the role of antagonist or would you prefer it to be revealed that he's actually the good guy and someone/something else is truly to blame for the horror?